Arsene Wenger: "I think Gervinho didn't deserve a red card, he should give a red to the two players or a yellow to the two.
"I feel the referee has not seen it and the linesman has not seen it properly.
"I'm 100 per cent sure that the referee did not see the incident so I would like to know who made the decision.
"We had a solid performance where we controlled the game. We missed our chances in the first half and missed a little accuracy with the final ball.
"They tried to slow the game down and defend well, we were pushing to score and it is difficult to say whether we would have scored or not (without the sending-off)."
Neither skipper Cesc Fabregas nor fellow midfielder Samir Nasri were involved in the 0-0 draw at St James' Park.
Arsene Wenger: "Yes, we are concerned by that because when you take players at 16, 17, 18 years old and you play them in the Premier League, you need to be brave.
"But you do it first of all because you think they deserve it, but secondly as well because you think the club will be rewarded when they are 23, 24 and are in a position to deliver.
"It is a concern, of course - but if the financial fair play comes in, I think we will be in a very strong position. But at the moment, it doesn't exist."